I was thinking, the energy stored in a coil is P=.5L x I^2 where L is inductance, and I is current,

And since the equation for energy stored in a cap is P=.5C x I^2 so...

set one equal to the other and you can find how much current a capacitor discharged into a coil will create, and how much voltage a coil discharging into a cap will create, (minus losses of course).

Seem like a reasonable plan of attack?